I recommend Helium to all aspiring writers and authors. It is a fun site where you can write a lot, get some feedback occasionally, and earn pennies a day through revenue shares. As a freelance writing opportunity I think it can pay off in the long run, but it has a steep curve.
Here are some of the articles I have written (click the link above for my Helium profile):
Sonnet – Origin of Thought
Debate – Is the Death Penalty Just or Unjust?
Article – Alternatives to Quitting Your Job
Article – How People Become Criminals
Creative writing – How a Picture is Worth a Thousand Words
Article – Love as a Confrontational Force
Article – How to Make Money in Entropia Universe
Flash fiction – During the Heatwave